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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72dfe024ec62784854fa32699b32a184b5cc9d6ee45f7efcd1bcfa536a218f4' 
  AND token = 'qr1uSZYIdoME8van873F4ikuifkVrFb2czwV83tBLj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}